Adjustable reamer.



W. PINUIN. ADJUSTABLE REAMER.

APPLICATION FILED D2015, 1911 1,089,722. Patented Mar. 10, 1914.

2 EHBET8SHEET 1.

111v 2 we WILLIAM PINCI N W. PINGIN.

ADJUSTABLE REAMER.

APPLICATION FILED 11620.15, 1911,

Patented Mar. 10, 1914.

Z BKBETS-SHBET 2.

l N VE 1V7 OR w 0 w P M A u L W WILLIAM PINCIN, OF ALTOONA, PENNSYLVANIA.

ADJUSTABLE BEAM ER.

Application filed December 15, 1911.

Specification of Letters Patent.

Pniicntcilt Illar. iitt, ital Serial No. 665,942.

To all whom it may concern Be it known that I, WILLIAM PINCIN, a citizen of the United States, residing at Altoona, in the county of Blair and State of Pennsylvania, have invented certain new and useful Improvements in Adjustable Reamers, of which the following is a specification.

This invention relates to machine tools and specifically to reamers of the adjustable type, and the principal object of the same is to provide a new and practical m thod of adjustment for expansion rea1ners, whereby any desired diameter of hole can be reamed absolutely true and accurate.

Another object of this invention is to pro vide improved means of holding the cutting edges, or blades, thus enabling the reamer to withstand rough usage, such as machine tools are generally subjected to.

A further object of the invention is the micrometer adjustment together with the improved means to secure the adjustment.

With these and many other objects in view, which will be more readily apparent, as the nature of the invention is better inderstood, the same consists of the irtovel construction, combination and arrangementi (f parts as will be hereinafter fully illustrated, pointed out and claimed.

The essential features of the invention iu volved, in carrying out the objects above.

indicated, are naturally susceptible to a wide range of structural modification, within" the scope of the claim, but apret'erred and practical embodiment thereof is shown in the accompanying drawings, in which Figure 1 is a half sectional plan view of my improved expansion reamer, showing all the parts assembled together, as the reamer would appear when ready focuse. Fig. 2 is a side elevation of the parts shown in Fig. 1 of the drawings. Fig. 3 is an end elevation of the iarts shown in Fig. .2. Fig. 4 is a side and ec go elevation of the graduated adjusting nut. Fig. 5 is an edge and side view of the rear locking nut. Fig. 6 is a plan and side elevation of the cutting blade locking nut. This particular detail serves to hold the rear end of the cutting blades in a firm position. Fig. 7 illustrates the side and end views of the adjusting mandrel. Fig. 8 is a plan and side elevation of the mandrel cap. Fig. 9 illustrates a t'rontand edge View of one of th adjusting nuts.

Fig. 10 shows an edge and side elevation of one of the cutting blades. Fig. it is a view of the locking pin.

Like reference numerals designate corresponding parts throughout the several. figures oi the drawings.

This improved adjustable reamcr primafportion 13, receives ll adjusting nuts 14-,

to and 16, and the cutting blade locking nut 17. The forward portion of the body 10 is provided with a plurality of grooves "d, into which are set the cutting elcu'ients 19. The. lower curved surface 20, of the blade 19 abuts upon the concave surface 51d, ot the groove 18 in the body portion 10. This form of abutment provides a very 'nractical Tiltil'l'ln for minute :uljusturent of the blades which is a very ucccssapy equirement ,t'or accurate reaming. j

The forward end portion oi the cutting blade 1.9, is provided with a locking ledge 23, which engages the beveled face. 2 1, of the screw cap :25, which is preliwrably provir lcd with a plurality of diagonally opposite spaced drilled holes 56, which are intended to receive a wrench for adjusti the cap. The screw cap 25 serves in a verj, practical way to hold the sectitauai S, firmly together through the action of the interlocking feature, as shown at 9252", Fig. IV of drawings. ln addition to holding the segments firmly together, the cap 235, terms a seat which receives the forward end of the cutting blades and firmly intcrdoclrs them in position.

The inside :l'acc 27, of the cap 225i, is cugaged by the base oi the adjrsting Illdfl (lrel 99, the stem 10 of which occupies a central position in the body 10. The hole in the body 10, which receives the tem 30 is preferably drilled, then rea'iued to size, while the hole in the forward end of the body 10. that receives the co'iiicshaped portion oi the. mandrel, may be out out on a lathe before the grooves are cut. the finish oi the inside slllftlt't. not. being essentially accurate, the only precautions necessary being to see that the inclined face ol the, bla do 19.,

the mandrel does not engage the inside face ot" the hole made in the body 10 for its reception The rear end of the cutting blade 19, is provid d with a beveled face 32, which is ed by the face 38, of thelocking nut drawing the face 33 up against the face 32 of the; cutting blade, it is that the blade will be forced up the cap 25, andheld in a firmly 'llhe blade locking nut 17 i h a hole 34, which is adapted adjusting not 16; the graduations on nut being preferably made at 1/10 inch 0 rt, each graduation representing in this particular instrument .025 of the cutting blades. The locking nut 16 is provided with aset screw 35, which is a necessary means otadjusting the position of the nut 16 to compensate for loss of size after grinding 'lhc'locking nut 15 is also provided with a series of graduations 36,

.preterab v 50 in number, when the taper of ,the pol n 8'? of the mandrel is 6 inches relies, which is prcierred when a wide of ad; tmcrt is required.

1c adjustment of this improved l'eamcr may be described as follows; To increase e. of the reanier that is to set the l; 51 out, thus enlarging the hole reamed: t- 'ing nuts .14. and l? are loosened, the

oseyree \Vithout further description and claboration, it is thought that the many advantages of the herein described adjustable reamer are readily apparent.

What I claim is,

An adjustable reamer comprising a hollow cylindrical exteriorly threaded body, a stem provided with a cone shaped end portion adjustable in said body, a cap member associated with the cone shaped end of the said stem, cutting blades adapted to bear against the conical surface of the stem, a clamping nut adjustable on the exterior threaded portion of the body for clamping the blades upon the cone shaped end of the stem and also against the cap member, and graduated. means -for adjusting, the blades also mountcdon the exterior threaded portion of the body. r

In testimony whereof I hereunto aflix my signature in the presence of two Witnesses.

WILLIAM rinoin.

Witnesses N E. MARY C. MAoConMAo. 

